Composition of matter for sound-records.



N0- 854,801. PATBNTED MAY 28, 1907. G. K. CHENEY.

COMPOSITION OF MATTER FOR SOUND RECORDS. APrLIoAUoN FILED JUNE 6. 190a.

a WITNESSES: INVENTOR ATTORNEY UNITED STATES PATENT f OFFICE.

GEORGE K. CHENEY, on NEW YORK,

N. Y., ASSIGNOR, BY MESNE ASSIGN- MENTS, TO VICTOR TALKING MACHINE COMPANY, A CORPORATION OF NEW JERSEY.

COMPOSITION OF MATTER FOR SOUND-RECORDS.

Specification of Letters Patent.

Application filed June 6, 1903. Serial No. 160.432.

Patented May 28, 1967.

To all whom it may concern:

Be it known that I, GEORGE K. CHENEY, a citizen of the United States of America, and a resident of the borough of Manhattan, city, county, and State of New York, have invented certain new and useful Improvements in Composition of Matter for Sound-Records, of which the following is a specification.

My invention relates generally to sound record tablets and is more specifically designed to produce a composition of matter for use as a recording surface or record tablet for talking machines. For this purpose, it is desirable that such a material should be perfectly amorphous and sufliciently hard and tough to permit ordinary handling and resist changes in temperature. At the same time, it must not be too brittle, as this property tends to cause it to crack, chip and break unevenly under the action of the cutting style, which results in mutilating the record and gives rise to harsh .unpleas ant sounds on reproduction. The material should furthermore be of such texture and possess suflicient coherence to permit a sharp clean cut to be made in the surface thereof groove is clean-cut and the walls or surface 40 thereof are smooth and entirely free of mequalities.

The accompanying drawing illustrates a common form of record tablet, such as is ordinarily employed in practice.

The tablet may be formed throughout of the composition or the body A, thereof may be of a different material and coated to a suitable depth with the composition to form a record surface B.

In carrying out my invention, I take ozocerite and paraflin in suitable proportions, preferably about equal parts, and reduce or concentrate the same by the application of heat. As the material melts, the temperature is gradually increased, until the boiling point is reached and it is thereafter raised to 350 or 400 Fahrenheit and continued foran hour or more, or until, on test, it exhibits the required degree of hardness, toughness, etc. It is then poured into molds conforming to the desired shape of the record blanks or tab lets and allowed to cool and harden. U on being removed from the molds, the su ace B, of the blank is trued up to receive the- GEORGE K. oiiENEY.

Witnesses: I

' J. E. PEARSON, I W. H. PUMPHREY. 

